WO2011069139A2 - Enveloppe de câble coaxial - Google Patents

Enveloppe de câble coaxial Download PDF

Info

Publication number
WO2011069139A2
WO2011069139A2 PCT/US2010/059002 US2010059002W WO2011069139A2 WO 2011069139 A2 WO2011069139 A2 WO 2011069139A2 US 2010059002 W US2010059002 W US 2010059002W WO 2011069139 A2 WO2011069139 A2 WO 2011069139A2
Authority
WO
WIPO (PCT)
Prior art keywords
layer
edge section
conductive tape
conductive
coaxial cable
Prior art date
Application number
PCT/US2010/059002
Other languages
English (en)
Other versions
WO2011069139A3 (fr
Inventor
Noah Montena
Original Assignee
John Mezzalingua Associates, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by John Mezzalingua Associates, Inc. filed Critical John Mezzalingua Associates, Inc.
Publication of WO2011069139A2 publication Critical patent/WO2011069139A2/fr
Publication of WO2011069139A3 publication Critical patent/WO2011069139A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors
    • H01B11/1826—Co-axial cables with at least one longitudinal lapped tape-conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors
    • H01B11/1813—Co-axial cables with at least one braided conductor

Definitions

  • Typical coaxial cable includes radio frequency (RF) shielding.
  • RF radio frequency
  • One common type of shielding is a conductive tape that attenuates interfering electromagnetic radiation in the high frequency range.
  • a prior art coaxial cable 100 is disclosed. As disclosed in Figure 1A, the coaxial cable 100 is terminated on either end with a connector 150. With reference now to Figure IB, the prior art coaxial cable 100 generally includes a center conductor 102 surrounded by a dielectric 104, a conductive tape 106 wrapped longitudinally around the dielectric, a braid 108 surrounding the conductive tape 106, and a jacket 110 surrounding the braid 108.
  • the conductive tape 106 surrounds the dielectric 104, and generally serves to limit the ingress and egress of high frequency electromagnetic radiation 1 12 to/from the center conductor 102.
  • the conductive tape 106 is a laminate tape that includes an aluminum layer 114 and a polymer bonding agent layer 1 16.
  • the conductive tape 106 also defines a first edge section 1 18 that overlaps a second edge section 120 as the conductive tape 106 is wrapped around the longitudinal direction of the dielectric 104, resulting in an overlapping seam.
  • example embodiments of the present invention relate to coaxial cable shielding.
  • Some example embodiments eliminate overlap apertures at overlapping edges of a conductive tape during the manufacturing of a coaxial cable. In coaxial cable, this elimination of overlap apertures results in an increase in the uniformity of the shielding of interfering high frequency electromagnetic radiation.
  • a coaxial cable includes a center conductor surrounded by a dielectric, a conductive tape surrounding the dielectric, and a jacket surrounding the conductive tape.
  • the conductive tape includes a conductive layer and a bonding agent layer immediately adjacent to the conductive layer.
  • the conductive tape defines first and second edge sections that each borders an interior section.
  • the conductive tape is wrapped around the dielectric such that the first edge section overlaps with the second edge section.
  • the bonding agent layer extends over only at most a portion of the first edge section such that at least a portion of the conductive layer in the first edge section is immediately adjacent to at least a portion of the conductive layer in the second edge section.
  • a coaxial cable in another example embodiment, includes a center conductor surrounded by a dielectric, a conductive tape surrounding the dielectric, a braid surrounding the conductive tape, and a jacket surrounding the braid.
  • the conductive tape includes a conductive layer and a polymer bonding agent layer immediately adjacent to the conductive layer.
  • the conductive tape defines first and second edge sections that each borders an interior section.
  • the conductive tape is wrapped around the dielectric such that the first edge section overlaps with the second edge section.
  • the polymer bonding agent layer does not extend over any portion of the first edge section such that the conductive layer in the first edge section is immediately adjacent to the conductive layer in the second edge section.
  • a coaxial cable includes a center conductor surrounded by a dielectric, a conductive tape surrounding the dielectric, a braid surrounding the conductive tape, and a jacket surrounding the braid.
  • the conductive tape includes a conductive layer and a polymer bonding agent layer immediately adjacent to the conductive layer.
  • the conductive tape defines first and second edge sections that each borders an interior section. A strip of the polymer bonding agent layer covers only a portion of the first edge section and a band of the polymer bonding agent layer covers the second edge section and at least a portion of the interior section.
  • the conductive tape is wrapped around the dielectric with the first edge section overlapping with the second edge section such that a portion of the Attorney Docket ID-1486-PCT conductive layer in the first edge section is immediately adjacent to a portion of the conductive layer in the second edge section.
  • a conductive tape suitable for use in a coaxial cable includes a conductive layer and a bonding agent layer immediately adjacent to the conductive layer.
  • the conductive tape defines first and second edge sections that each borders an interior section such that the conductive tape is capable of being wrapped around a dielectric so that the first edge section overlaps with the second edge section.
  • the bonding agent layer extends over only at most a portion of the first edge section such that, when the first and second edge sections are overlapped, at least a portion of the conductive layer in the first edge section is immediately adjacent to at least a portion of the conductive layer in the second edge section.
  • Figure 1A is a perspective view of a prior art example coaxial cable terminated with two example connectors
  • Figure IB is a perspective view of a portion of the prior art coaxial cable of Figure 1A, the perspective view having portions of each layer of the prior art coaxial cable cut away;
  • Figure 1C is a cross-sectional view of the prior art coaxial cable of Figure IB;
  • Figure ID is an enlarged view of a portion of the cross-sectional view of Figure 1C;
  • Figure 2A is a perspective view of a portion of an example coaxial cable with a first example conductive tape configuration, the perspective view having portions of each layer of the example coaxial cable cut away; Attorney Docket ID-1486-PCT
  • Figure 2B is a cross-sectional view of the example coaxial cable of Figure 2A;
  • Figure 2C is an enlarged view of a portion of the cross-sectional view of Figure 2B;
  • Figure 2D is a perspective view of a section of the example conductive tape of Figures 2A-2C prior to the inclusion of the example conductive tape as a layer of the example coaxial cable of Figures 2A-2C;
  • Figure 2E is a cross-sectional view of the example conductive tape of Figure 2D;
  • Figure 2F is an enlarged view of a portion of the cross-sectional view of Figure 2C with a second example conductive tape configuration
  • Figure 2G is a cross-sectional view of a section the example conductive tape of Figure 2F prior to the inclusion of the example conductive tape as a layer of the example coaxial cable of Figure 2F.
  • Example embodiments of the present invention relate to coaxial cable shielding.
  • the same reference numbers will be used throughout the drawings to refer to the same or like parts.
  • These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention.
  • Other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention.
  • the various embodiments of the invention although different, are not necessarily mutually exclusive.
  • a particular feature, structure, or characteristic described in one embodiment may be included within other embodiments.
  • the following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled.
  • the example coaxial cable 200 can be any type of coaxial cable including, but not limited to, 50 Ohm and 75 Ohm coaxial cable.
  • the coaxial cable 200 generally includes a center conductor 202 surrounded by a dielectric 204, a conductive tape 206 wrapped longitudinally around the dielectric, a braid 208 surrounding the conductive tape 206, and a jacket 210 surrounding the braid 208.
  • the phrase "surrounded by” refers to an inner layer Attorney Docket ID-1486-PCT generally being encased by an outer layer. However, it is understood that an inner layer may be "surrounded by" an outer layer without the inner layer being immediately adjacent to the outer layer. The term "surrounded by” thus allows for the possibility of intervening layers.
  • the center conductor 202 is positioned at the core of the example coaxial cable 200.
  • the center conductor 202 can be configured to carry a range of electrical current (amperes) as well as an RF/electronic digital signal.
  • the center conductor 202 is formed from solid copper, copper-clad aluminum (CCA), copper-clad steel (CCS), or silver-coated copper-clad steel (SCCCS), although other conductive materials are possible.
  • the center conductor 202 can be formed from any type of conductive metal or alloy.
  • the center conductor 202 can be solid, hollow, stranded, corrugated, plated, or clad, for example.
  • the dielectric 204 surrounds the center conductor 202, and generally serves to support and insulate the center conductor 202 and the conductive tape 206.
  • a bonding agent such as a polymer, may be employed to bond the dielectric 204 to the center conductor 202.
  • the dielectric 204 can be, but is not limited to, taped, solid, or foamed polymer or fluoropolymer.
  • the dielectric 204 can be foamed polyethylene (PE).
  • the conductive tape 206 surrounds the dielectric 204, and generally serves to minimize the ingress and egress of high frequency electromagnetic radiation 112 to/from the center conductor 202.
  • high frequency electromagnetic radiation is radiation with a frequency that is greater than or equal to about 50 MHz.
  • the conductive tape 206 is a laminate tape that includes an aluminum layer 214 and a polymer bonding agent layer 216. It is understood, however, that the discussion herein of the conductive tape 206 is not limited to conductive tape having any particular combinations of layers.
  • the conductive tape 206 can instead include, but is not limited to, the following layers: copper/polymer/polymer bonding agent, aluminum/polymer/polymer bonding agent, aluminum/polymer, or aluminum/polymer/aluminum/polymer bonding agent.
  • the example embodiment of the conductive tape 206 defines first and second edge sections 218 and 220 that each borders an interior section 224.
  • the conductive tape 206 is formed such that the Attorney Docket ID-1486-PCT polymer bonding agent layer 216 does not extend over the first edge section 218.
  • the conductive tape 206 is formed such that there is a bare strip of the aluminum layer 214 along the first edge section 218.
  • the first edge section 218 overlaps with the second edge section 220.
  • the polymer bonding agent layer 216 is a dielectric layer, and thus is not effective at shielding interfering electromagnetic radiation 112
  • the absence of the polymer bonding agent layer 216 along the first edge section 218 eliminates entirely the typical overlap aperture in the conductive tape 206 (compare to the overlap aperture 122 of Figure ID).
  • the bare strip of the aluminum layer 214 along the first edge section 218 enables the aluminum layer 214 in the first edge section 218 to be immediately adjacent to the aluminum layer 214 in the second edge section 220. This metal- on-metal contact provides very effective shielding at the overlap of the conductive tape 206 against high frequency electromagnetic radiation 1 12.
  • the elimination of an overlap aperture in the overlap of the conductive tape 206 results in less high frequency electromagnetic radiation 112 from the center conductor 202 exiting the example coaxial cable 200.
  • This elimination of the overlap aperture increases the shielding effectiveness of the overlapping edges portions 218 and 220 of the conductive tape 206, which increases the uniformity of the shielding of interfering high frequency electromagnetic radiation in the coaxial cable 200.
  • an alternative conductive tape 206' can be formed such that there is a band of the polymer bonding agent layer 216 covering the second edge section 220 and at least a portion of the interior section 224, and a strip of the polymer bonding agent layer 216 along only a portion of the first edge section 218, leaving a bare strip of the aluminum layer 214 along the first edge section 218 and sandwiched in between the strip and the band of the polymer bonding agent layer 216.
  • the first edge section 218 overlaps with the second edge section 220.
  • the absence of the polymer bonding agent layer 216 along a portion of the first edge section 218 eliminates entirely the typical overlap Attorney Docket ID-1486-PCT aperture in the conductive tape 206 (compare to the overlap aperture 122 of Figure ID).
  • the bare strip of the aluminum layer 214 along the portion of the first edge section 218 enables the aluminum layer 214 in the first edge section 218 to be immediately adjacent to the aluminum layer 214 in the second edge section 220.
  • This metal-on-metal contact provides very effective shielding at the overlap of the conductive tape 206 against high frequency electromagnetic radiation 1 12. Further, the strip of polymer bonding agent layer 216 along the first edge section 218 secures the top edge section 218 to the bottom edge section 220 of the alternative conductive tape 206'.
  • Another alternative conductive tape that includes multiple layers of aluminum and polymer may have at least a portion of the polymer layers absent in an overlapping edge section in order to allow each of the aluminum layers to achieve metal-on-metal contact, thus eliminating overlap apertures in the conductive tape.
  • the braid 208 surrounds the conductive tape 206, and generally serves to minimize the ingress and egress of electromagnetic radiation to/from the center conductor 202.
  • the braid 208 also serves to give structural support to, and thereby strengthen, the coaxial cable 200.
  • the braid 208 can be formed, for example, from inter-woven, fine gauge aluminum or copper wires, such as 34 American wire gauge (AWG) wires.
  • AWG 34 American wire gauge
  • the braid wires of the braid 208 are depicted as single wires in Figure 2A, each wire actually represents several round 34 AWG wires. It is understood, however, that the discussion herein of braid is not limited to braid formed from any particular type, size, and/or number of wires.
  • the braid 208 provides a radial inward pressure on the conductive tape 206, or the alternative conductive tape 206', thus allowing the aluminum layer 214 of the conductive tapes to achieve secure metal-to-metal contact along the overlap of the conductive tapes.
  • the jacket 210 surrounds the braid 208, and generally serves to protect the internal components of the coaxial cable 200 from external contaminants, such as dust, moisture, and oils, as well as wear and tear over time, for example.
  • the jacket 210 can be formed from materials such as, but not limited to, polyethylene (PE), high-density polyethylene (HDPE), low-density polyethylene (LDPE), or linear low-density polyethylene (LLDPE), foamed PE, polyvinyl chloride (PVC), or polyurethane (PU), or some combination thereof.
  • PE polyethylene
  • HDPE high-density polyethylene
  • LDPE low-density polyethylene
  • LLDPE linear low-density polyethylene
  • foamed PE polyvinyl chloride
  • PU polyurethane
  • single-shield cable (where the cable include only a single conductive tape layer), tri-shield cable (where the cable includes one braid layer and two conductive tape layers), quad-shield cable (where the cable includes two braid layers and two conductive tape layers), and messengered coaxial cable (where the cable includes a messenger wire embedded in the jacket that provides support in situations where the cable aerially spans long distances, such as 75 feet or more) can be configured to include the conductive tape 206 or the alternative conductive tape 206'.
  • flooded coaxial cables can be configured to include the conductive tape 206 and/or the alternative conductive tape 206'. It is further understood that cable configurations having two or more conductive tape layers immediately adjacent to one another and/or two or more braid layers immediately adjacent to one another can be configured to include the conductive tape 206 or the alternative conductive tape 206'.
  • coaxial cables with helically wrapped conductive tape can likewise be configured to have metal-on-metal edge sections similar to the edge sections 218 and 220 of the conductive tape 206.
  • These metal-on-metal edge sections eliminate overlap apertures that run in a helical course along the face of the top portion of the helically wrapped conductive tape. This elimination of the overlap apertures will increase the shielding effectiveness of the helically wrapped conductive tape at or near the overlap, and will further result in an increase in the uniformity of the shielding of interfering high frequency electromagnetic radiation in the coaxial cable.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)

Abstract

L'invention porte sur une enveloppe de câble coaxial. Dans un mode de réalisation à titre d'exemple, un câble coaxial comprend un conducteur central entouré par un diélectrique, un ruban conducteur entourant le diélectrique et une gaine entourant le ruban conducteur. Le ruban conducteur comprend une couche conductrice et une couche d'agent de liaison immédiatement adjacente à la couche conductrice. Le ruban conducteur définit des première et seconde sections de bord qui bordent chacune une section intérieure. Le ruban conducteur est enroulé autour du diélectrique de telle manière que la première section de bord chevauche la seconde section de bord. La couche d'agent de liaison s'étend seulement sur au plus une partie de la première section de bord de telle manière qu'au moins une partie de la couche conductrice dans la première section de bord est immédiatement adjacente à au moins une partie de la couche conductrice dans la seconde section de bord.
PCT/US2010/059002 2009-12-04 2010-12-04 Enveloppe de câble coaxial WO2011069139A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/631,656 2009-12-04
US12/631,656 US20110132653A1 (en) 2009-12-04 2009-12-04 Coaxial cable shielding

Publications (2)

Publication Number Publication Date
WO2011069139A2 true WO2011069139A2 (fr) 2011-06-09
WO2011069139A3 WO2011069139A3 (fr) 2011-09-09

Family

ID=44080905

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2010/059002 WO2011069139A2 (fr) 2009-12-04 2010-12-04 Enveloppe de câble coaxial

Country Status (4)

Country Link
US (1) US20110132653A1 (fr)
CN (2) CN202049765U (fr)
TW (1) TW201126543A (fr)
WO (1) WO2011069139A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110132653A1 (en) * 2009-12-04 2011-06-09 John Mezzalingua Associates, Inc. Coaxial cable shielding
US11894631B2 (en) * 2021-11-24 2024-02-06 Caterpillar Inc. Concentric conductor

Citations (4)

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US5039197A (en) * 1990-03-22 1991-08-13 Northern Telecom Limited Cable and tape structures therefor
US6384337B1 (en) * 2000-06-23 2002-05-07 Commscope Properties, Llc Shielded coaxial cable and method of making same
JP2004220798A (ja) * 2003-01-09 2004-08-05 Yazaki Corp シールドケーブル
JP2005174598A (ja) * 2003-12-08 2005-06-30 Fujikura Ltd 高周波同軸ケーブル

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JPS5948499B2 (ja) * 1980-04-10 1984-11-27 住友電気工業株式会社 ラミネ−トシ−スの製造方法
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US5949018A (en) * 1996-12-23 1999-09-07 Commscope, Inc. Of North Carolina Water blocked shielded coaxial cable
GB9701329D0 (en) * 1997-01-23 1997-03-12 Merritt Adrian L Improvements in and relating to materials
JP2002530830A (ja) * 1998-11-25 2002-09-17 コーニング ケーブル システムズ リミテッド ライアビリティ カンパニー シールド電気ケーブルを作るための方法ならびに装置
US20020090496A1 (en) * 2000-11-01 2002-07-11 Sang-Hoon Kim Adhesive tapes and adhesive note pads featuring non-adhesive sections
JP4914539B2 (ja) * 2001-05-18 2012-04-11 矢崎総業株式会社 シールドハーネスの組立方法
US20040154823A1 (en) * 2003-02-10 2004-08-12 Amato Alan John Quadruple bonded cable
US20110132653A1 (en) * 2009-12-04 2011-06-09 John Mezzalingua Associates, Inc. Coaxial cable shielding

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US5039197A (en) * 1990-03-22 1991-08-13 Northern Telecom Limited Cable and tape structures therefor
US6384337B1 (en) * 2000-06-23 2002-05-07 Commscope Properties, Llc Shielded coaxial cable and method of making same
JP2004220798A (ja) * 2003-01-09 2004-08-05 Yazaki Corp シールドケーブル
JP2005174598A (ja) * 2003-12-08 2005-06-30 Fujikura Ltd 高周波同軸ケーブル

Also Published As

Publication number Publication date
US20110132653A1 (en) 2011-06-09
CN202049765U (zh) 2011-11-23
WO2011069139A3 (fr) 2011-09-09
CN102087890A (zh) 2011-06-08
TW201126543A (en) 2011-08-01

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